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Play around with truncating the URL. A clue is that there are zip files of DEMs there - so the whole thing was no doubt generated & rendered. Other views include the same dataset with clouds and ice - pretty stuff indeed!

There's a folder on there with a file named bryce.zip, which makes me uneasy - bryce is not open source. But it is shareware. Still, I'd rather get it from the developer. Hmmmm - but there's some kind of promotion right now where bryce7 pro can be had for free: the developer's site: http://www.daz3d.com/products/bryce/...what-is-bryce/ Looks like they usually separate into a free version, a better version that costs a little, and a pro version that costs more. Bryce is a rendering package, so that's a plausible pathway to the world map you link to.

Yes, you can do it in photoshop with a bit of work (probably with GIMP, but I haven't used it in years and can't remember the vocabulary translations). I've been working on a similar something recently and can point you in a very general direction to look into... I know there are many tutorials around that cover these things much better than I could ever explain them.

For shading such as the tutorial which waldronate provided (thank you for that, by the way - reps coming) you can play with gradient maps in photoshop, again combined with the original height map (duplicate that layer(place it above the shaded relief layer), probably change the layer style to color, and you may want to heighten the contrast a bit if you find that the shading is too subtle for your taste).

For shading natural vegetation in photoshop, you can use the paint brush and common sense. =)